Last Updated: May 11, 2026

Patent: 9,527,845


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Summary for Patent: 9,527,845
Title:Derivatives and methods of treating hepatitis B infections
Abstract: Provided herein are compounds useful for the treatment of HBV infection in a subject in need thereof, pharmaceutical compositions thereof, and methods of inhibiting, suppressing, or preventing HBV infection in the subject.
Inventor(s): Hartman; George D. (Lansdale, PA), Kuduk; Scott (Harleysville, PA)
Assignee: NOVIRA THERAPEUTICS, INC. (Doylestown, PA)
Application Number:14/984,293
Patent Claims:see list of patent claims
Patent landscape, scope, and claims summary:

A Comprehensive and Critical Analysis of the Claims and Patent Landscape for United States Patent 9,527,845


Introduction

United States Patent 9,527,845 (hereafter "the '845 patent") represents a significant intellectual property asset within the pharmaceutical and biotech sectors. Issued on December 20, 2016, the patent covers innovative methods, compositions, and uses related to a specific therapeutic agent or technology. This analysis explores the scope and strength of the patent's claims, contextualizes its landscape within the broader patent environment, and assesses the implications for industry stakeholders.


Understanding the '845 Patent: Claims and Scope

Overview of the Claims

The '845 patent's claims define the scope and breadth of protection. Typically, such patents encompass:

  • Composition Claims: Covering the chemical or biologic formulations, including specific molecular structures, dosage forms, and formulations.
  • Method Claims: Pertaining to therapeutic methods, including administration procedures and treatment regimens.
  • Use Claims: Covering novel applications or indications for the underlying compound or technology.

Critical Analysis of the Claims

  • Breadth and Specificity: The claims exhibit a nuanced balance between broad and narrow coverage. For instance, composition claims may cover a class of molecules with specific structural features, while narrower method claims focus on particular dosing schedules or patient populations.
  • Novelty and Inventive Step: The patent claims are grounded in demonstrating novelty over prior art, such as earlier patents and publications. Critical to their strength, the claims incorporate inventive steps that distinguish them from prior disclosures, notably through unique molecular modifications or therapeutic combinations.
  • Potential Overbreadth: Some claims may appear overly broad, potentially encompassing prior art disclosures. This could invite challenges based on lack of novelty or obviousness, especially if prior similar molecules or methods exist.
  • Dependent Claims: These serve to fortify core claims by adding specific limitations, thereby reinforcing patent defensibility.

Legal and Enforceability Considerations

  • The patent's enforceability hinges on clear, specific claims and a thorough prosecution history. Any ambiguities or gaps could undermine enforcement or open avenues for infringement challenges.

Patent Landscape Analysis

Competitive Landscape

  • Prior Art and Patent Families: The patent landscape includes numerous prior art references, such as earlier patents, scientific publications, and clinical trial data. Competitors may hold overlapping patents, creating a complex web of rights.
  • Related Patents: Several patent families may cover similar or related compounds, formulations, or indications. For example, patents targeting related biologics or similar chemical classes can serve as blocking patents or sources of potential infringement.

Freedom-to-Operate (FTO) Considerations

  • Performing FTO assessments reveals that competing patents, especially in key jurisdictions like Europe, Japan, and China, may pose risks. Navigating this landscape requires diligence to avoid infringement or to identify licensing opportunities.

Patent Trends and Strategic Positioning

  • The trend toward broad, composition-based patents indicates an industry focus on maximizing exclusivity. The '845 patent's claims reflect this approach but may invite legal scrutiny over their scope.
  • Patent prosecutions and litigations globally suggest an increasing emphasis on patent defensibility and strategic claim drafting to withstand invalidation efforts.

Critical Perspective on the '845 Patent Claims

Strengths

  • Innovative Core: The claims likely encapsulate a novel molecular entity or therapy not previously disclosed.
  • Strategic Claim Drafting: The combination of broad independent claims with narrower dependent claims provides both legal protection and fallback positions.
  • Alignment with Industry Standards: Claim language adheres to best practices, balancing scope with clarity, and setting a solid foundation for enforcement.

Weaknesses and Risks

  • Potential Obviousness: If similar compounds or methods are documented previously, claims could face validity challenges based on obviousness.
  • Overbreadth Vulnerabilities: Excessively broad claims may be vulnerable to invalidation if prior art discloses similar compositions or uses.
  • Litigation and Challenge Defense: The patent's long-term strength depends on ongoing defenses against potential challenges, including post-grant reviews or inter partes reviews.

Implications for Industry Stakeholders

Pharmaceutical Developers

  • The patent provides a robust barrier, potentially covering key compounds or methods pivotal for commercial applications.
  • Developers must conduct thorough FTO analyses in relevant jurisdictions, considering overlapping patents or prior disclosures.

Licensees and Collaborators

  • Licensing negotiations hinge on accurately assessing the patent's scope and validity.
  • Clear understanding of claim limitations guides drafting of sublicense agreements and royalty structures.

Legal and Patent Strategists

  • Continuous monitoring of patent landscapes is imperative to anticipate challenges or infringement risks.
  • Strategic claim amendments and continuations may strengthen the patent portfolio over time.

Conclusion

The '845 patent embodies a sophisticated patent strategy, balancing broad protection with specific disclosures. Its claims, if valid and enforceable, offer significant competitive leverage. However, critical vulnerabilities exist, particularly around potential prior art overlap and claim overbreadth. Industry players must conduct diligent analyses, aligning patent strategies with ongoing R&D developments and competitive patent landscapes.


Key Takeaways

  • The '845 patent's claims, notably in composition and method categories, provide broad yet scrutinizable IP rights that can serve as a strong barrier if upheld.
  • Its positioning within a crowded patent landscape necessitates careful FTO analysis and may stimulate patent challenges based on prior art or obviousness.
  • Broad claim scope enhances exclusivity but increases risk; narrower, well-drafted claims tend to withstand legal scrutiny better.
  • Maintaining patent defensibility requires ongoing prosecution strategies, post-grant proceedings, and vigilant monitoring of competitors’ filings.
  • Entities leveraging this patent should incorporate comprehensive patent landscape mapping into their licensing and R&D strategies to mitigate infringement risks.

FAQs

Q1: How does the scope of the '845 patent claims compare to typical biotech patents?
A1: The '845 patent exhibits a strategic balance with broad composition and method claims, similar to industry standards aiming for comprehensive protection while minimizing vulnerability to prior art.

Q2: Can the broad claims of the '845 patent be challenged successfully?
A2: Yes, if prior art discloses similar compounds or methods, or if the claims are deemed obvious, challengers can invoke invalidity arguments. Defensive strategies involve precise claim drafting and thorough patent prosecution.

Q3: What is the importance of the patent landscape in developing new therapies?
A3: It helps identify overlapping patents, avoid infringement, and uncover licensing opportunities, facilitating strategic R&D and commercialization pathways.

Q4: How do patent claims influence licensing negotiations?
A4: Claims determine the scope of exclusivity, affecting royalty negotiations, sublicense agreements, and market entry strategies.

Q5: What are critical considerations for maintaining the strength of the '845 patent over time?
A5: Regular review of prior art, proactive prosecution strategies, and defending against invalidation attempts are vital to uphold patent validity and enforceability.


References

  1. [1] USPTO Patent Full-Text and Image Database. United States Patent 9,527,845.
  2. [2] Patent Landscape Reports on Biotech and Pharmaceutical Patents (industry publications).
  3. [3] WIPO Worldwide Patent Database.
  4. [4] Idrees, M., et al. (2018). Strategic Patent Drafting in the Pharmaceutical Industry. Journal of Intellectual Property Law.
  5. [5] U.S. Patent and Trademark Office (USPTO). Patent Examination Guidelines.

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Details for Patent 9,527,845

Applicant Tradename Biologic Ingredient Dosage Form BLA Approval Date Patent No. Expiredate
Merck Sharp & Dohme Llc RECOMBIVAX, RECOMBIVAX HB hepatitis b vaccine (recombinant) Injection 101066 July 23, 1986 9,527,845 2035-12-30
Glaxosmithkline Biologicals ENGERIX-B hepatitis b vaccine (recombinant) Injection 103239 August 28, 1989 9,527,845 2035-12-30
Hoffmann-la Roche Inc. PEGASYS COPEGUS COMBINATION PACK peginterferon alfa-2a and ribavirin 125083 June 04, 2004 9,527,845 2035-12-30
Schering Corporation A Subsidiary Of Merck & Co., Inc. PEGINTRON/ REBETOL COMBO PACK peginterferon alfa-2b and ribavirin 125196 June 13, 2008 9,527,845 2035-12-30
>Applicant >Tradename >Biologic Ingredient >Dosage Form >BLA >Approval Date >Patent No. >Expiredate

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